Moderate drinking tea is very beneficial to human body, but if you drink too much tea at an unreasonable time, it will be harmful to human body. First, you shouldn't drink too much tea. Too much tea is easy to grow yellow teeth, and tea itself is diuretic. Drinking too much tea in autumn and winter affects sleep. The average amount of tea in autumn and winter is less than 500ml, which is about 2 cups of ordinary cups. You can drink more in summer Secondly, drinking tea and water after meals is the best time, which can not only eliminate fat and greasy, but also remove the odor in the mouth. In addition, when drinking tea at night, you should put less tea leaves, and don't make the tea too thick, otherwise it will excite your brain and is not conducive to sleep.